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ePaper created 2018-02-16, 11:17:41 | version 1.38.0
restoration of the edentulous maxilla case report | Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 3: Sintering the framework. Small sintering drops supported the framework during sintering. – Fig. 4: Checking the fit of the titanium sleeves after sintering. – Fig. 5: Comparison between the wax structure and the sintered framework. – Fig. 6: The fired framework with IPS e.max Ceram ZirLiner ready for veneering. – Fig. 7: Preparing for the wash bake. Both the gingival and the tooth areas were covered with the relevant materials. – Fig. 8: Selection of the required dentine materials (IPS e.max Ceram). Fig. 7 Fig. 8 were set as long as possible in order to achieve an exact result. It should be noted that the sintering time should not be shortened. After sintering, the framework had the required fitting accuracy. The restoration was perfectly supported with the occlu- sally positioned sintering drops (Fig. 3). The titanium sleeves could be easily inserted into the framework (Figs. 4 & 5). The recommended sintering programme: · 20–900 °C for 1.5 h (600 °C/h) · Holding time: 900 °C for 30 min · 900–1,450 °C for 2.75 h (200 °C/h) · 1,450 °C for 2 h · Cooling: 600 °C/h; from 1,450 to 900 °C · 900–300 °C for 1.2 h Preparing for veneering The next working steps require not only manual dexterity but also knowledge of the material firing parameters and furnace settings. This is the only way to ensure a balanced temperature distribution in the bonding area between the framework and the veneer. This in turn results in a sound bond and uniform shrinkage of the ceramic layer. Slow cooling of the restoration prevents the risk of tension in the fired restoration, which therefore minimises the risk of CAD/CAM 4 2017 21